Device for forming selvages on woven fabrics



' May 7, 1946. A. MOESSINGER V DEVICE FOR FORMING SELVAGES ON WQVEN FABRICS Filed Aug. 11, 1942 2 Sheets-Sheet l R. mm m w m mm A M T mm y 1946- A.- MOESSlNGER 2,399,880

DEVICE FOR FORMING SELVAGES ON WOVEN FABRICS Filed Aug. 11, 1942 2-Sheets-Sheet 2' mmvroa V ALEEETJJQESsING'EE.

ATTORNEY Patented May 7, 1946 DEVICE FOR FORMING SELVAGES ON WVOVEN FABRICS Albert Moessinger, Winterthur, Switzerland, as-

slgnor to Sulzer Freres, Socit Winterthur, Switzerland Anonyme,

Application August 11, 1942, Serial No. 454,399 In,Switzerland September 19, 1941 tion of this disk can lie approximately in the 8 Claims.

Looms are known in which the outermostwarp threads are specially manipulated by means of a continuously rotating device. These warp threads are unwound from two bobbins mounted in a rotating bobbin carrier.

When starting the loom, all these devices give very neat selvages, but the edges gradually become worse until the edgebinding threads finally break. The drawback of such devices consists in that the bobbins mounted in the bobbin carrier make a complete rotation about themselves for each rotation of the bobbin carrier. The binding threads unwound from the rotating bobbin carrier therefore receive, for each second pick one turn more or one turn less between the fabric and the bobbins. After several thousand picks the binding threads have a very great change in twist which cannot be compensated by the comparatively small forward motion of the binding threads, so that the strands of these threads become quite untwisted or so strongly twisted that they break.

The invention eliminates this drawback in that at least one of the two warp threads operating as binding threads is unwound from a bobbin mounted in a continuously rotating bobbin carwound from two separate bobbins mounted in the continuously rotating bobbin carrier, the two bobbins making with respect to the bobbin carrier also a motion influencing the twist of the binding threads. The average angular rotation of the bobbin, with respect to the bobbin carrier and affecting the twist of the thread, can be as great as the'average angular rotation of the bobbin carrier. The angular speed of the motion of the bobbin with respect to the bobbin carrier and affecting the twist of the thread can be as great as the angular speed of the bobbin carrier. Preferably the axis of rotation of the motion of the bobbin affecting the twist of the thread is parallel to the axis of rotation of the bobbin carrier, so that the bobbin makes a movement of translation.

One of the two binding threads can be drawn through the hollow shaft ofthebobbin carrier threads, can be mounted between the rotating bobbin carrier and the fabric. The axis of rotaplane of the warp at right angles to the warp threads, so that the disk takes up as little room as possible between the warp threads. The disk may also be fitted with an outer toothed annulus and be driven-and guided by two positively-operated toothed wheels. It can, however, also be driven and guided by one positively-operated and two free-running toothed wheels. By means of a Geneva-gear mechanism the disk may be caused to rotate intermittently and the bobbin carrier cancontinually rotate at the same mean angular speed. Easily changeable operating pins may be provided on the driver of the Geneva-gear mech-- anism for changing the binding of the binding threads. e

Between the bobbin carrier and the rotating disk a warp thread'stop motion can be mounted, in which the two binding threads are passed through the same plate spring of the stop motion and each binding thread is brought bythe rotatmg of the bobbin carrier or of the disk alternately into such a position that it raises the plate spring of the stop motion, whilst the other binding thread has no influence on the plate spring. Immediately after the bobbin a thread brake moving with the axis of the bobbin, may be mounted on the bobbin carrier.

Some examples of execution according to the invention. are shown diagrammatically in the drawings.

Fig. 1 is a longitudinal section and Fig. 2 a view from above of the device accordthe Fig. 8 shows a modification of the bobbin cari rier illustrated in Fig. 1.

According to Fig. 1 the warp threads] run from the warp beam 2 over the back rail 3 through the warp stop motion 4, the heddles 5, and the reed 6 to the fabric 1, which is wound onto the cloth beam 8. The binding threads 9 l and I0 run separately from the bobbins H and I2 through the thread brakes l3 and I 4 and through the eyes I! and it. From here the two binding threads 9 and in run together in a vertical slit l1, through a spring plate II of the stop motion 4 and through the eye l9. Then the two binding threads 9 and 10 run again separately through the two guide eyes 20 and 2| of the rotating disk 22 and finally together through the reed 6 to the fabric 1.

The two bobbins H and I2 are mounted in one common bobbin carrier support 23, which is subjected by the helically toothed wheels 24 and 25 to a rotation which may be continuous. When the binding threads 9 and III are drawn from the bobbin, the bobbins I l and i2 rotate on their axles 26 and 27 and receive a light braking action from the springs 30. The axles 26 and 21 are fixed in stirrups or carriers 28 and 23, which are pivotably mounted on the bobbin carrier 23 and rotate round the axles 3| and 32, these axles being at right angles to the axles 26 and 21.

The bobbin carrier 23 is pivotably supported on a pin 33 rigidly connected to the support 34. This pin 33 is connected to a toothed wheel 35 (Figs. 1 and 3). The axles 3| and 32 are also fitted with toothed wheels 36 and 31 which mesh with the toothed. wheel 35 by means of toothed wheels 36 and 39. For each rotation of the bobbin carrier 23, the axles 3| and 32 will carry out a movement through the meshing of the toothed wheels 35-39.

In this way the binding threads 3 and Ill do not change their twist during the running of the loom.

, The support 34 is rigidly held by a tube 40 rigidly connected to the loom. On the support 34 the driving shaft 4| of the toothed wheel 25 is carried. In Fig. 1 the disk 22 is rotated and also guided by two toothed wheels 42 driven by the shafts 43 and 44. These shafts 43 and 44 are carried in a frame 45 rigidly connected to the loom. T'hetoothed wheels 42 are also provided with disks 46 which make it possible to guide the rotating-disk 22 laterally.

The two binding threads 9 and iii are passed through the same spring plate l3. In order that the stop motion may be influenced by both these threads, the two threads are alternately moved up and down by the motion of the bobbin carrier 23. When the thread 3 is brought to the top it raises the plate spring l8. On the other hand the lower binding thread I is so far down-that the plate spring I3 is no longer raised by it if the upper thread 9 breaks, and the com is stopped by a known device. for instance by closing the electric contact between the rails I0 and H.

The rotating disk 22 and the bobbin carrier 23 are, for the sake of cleamess, drawn in such a position that the run of the two binding threads is visible over their whole length. Preferably, however, the plane formed by the two binding threads between the bobbin carrier and the warp stop motion 4, and the plane between the warp stop motion and the fabric, are displaced with respect to each other by 90", so that a compensation of the tension of the binding threads takes place when the shed is open or closed.

In Figs. 4 and a modification of the position of the rotating disk is given. The rotating disk 22 is operated by a toothed wheel 42 driven by the shaft 43 and is guided by the two toothed wheels 41 freely carried in the frame 43 which is rigidly connected to the loom. The lateral guiding of the disk 22 is ensured on the one hand by the lateral disks 46 connected to the toothed wheel 42, and on the other hand by the plates 49 connected to the fixed frame 43.

In Figs. 6 and 7 the drive of the rotary disk by means of a Geneva gear mechanism is shown.

The sprocket 50 driven by the loom is fixed to theoperating hub 5 I, which is rotatably supported on the axle 53 fixed on the sup ort 52. The support 52 is rigidly connected to the loom. The hub l5] carries a disk 5| on which the operating pins 54 are fixed. On this disk 5| a safety member 55 is also provided; it meshes in the arcuate outer part of the Geneva gear 56 and secures the Geneva gear in its position.

The Geneva gear 56 is rigidly keyed on the shaft 51 which is rotatably carried on the support 52. This shaft 5'! drives also a toothed wheel 58 which operates the driving shafts 43 and 44, of the rotary disk 22 by means of the toothed wheels 59. The sprocket wheel 55, driven by the 100m, drives through a chain 60 the shaft 4| which transmits the rotary motion of the bobbin carrier.

The difference between the arrangements illustrated in Fig. 8 and in Fig. 1 consists in the axis of rotation 12 (3! in Fig. 1) of the motion of the bobbin I3 (I I in Fig. 1), which causes the rotation of. the thread 9, being arranged at right angles to the axis of rotation 14 of the bobbin carrier 15 (23 in Fig. 1) and the bobbin carrier support 15 containing only one bobbin 13. The second thread I0 is guided through an eye 16 which moves with the bobbin carrier support 15. This thread in is afterwards led through the hole T1 in the shaft round which the bobbin carrier 15 rotates and comes either from a bobbin which is carried on a pin rigidly connected to the loom, or from the warp direct. The motion influencing the twist of the thread is transmitted through the bevel wheel in combination, a device supplying the edge forming warp threads and comprising a bobbin from which a warp thread is unwound, a disc-like warp thread guide member rotating about an axis substantially parallel to the weft threads and receiving the edge forming warp threads from said supply device and twisting same together between said disc-like member and the fabric, said edge forming warp threads moving from said supply device, and the latter rotating in such direction and at such speed relatively to the direction and speed of rotation of said disc-like guide member as to prevent twisting of said edge forming warp threads between said device and said guide member, and a drive mechanism for said guide member comprising a rotating member having stud members extending therefrom parallel to the axis of its rotation, a Geneva gear having slot means periodically. engaged by said stud members, and other gear means connected with said Geneva gear and engaging the periphery of and, due to the action of said Geneva gear, periodically rotating said disc-like member.

2. A mechanism for forming selvages on fabrics woven on gripper shuttle looms, comprising, in combination, a device supplying the edge forming warp threads and comprising a bobbin from which a warp thread is unwound, a disc-like warp thread guide member rotating about an axis substantially parallel to the weft threads and reasoaeeo I supply device, and the latter rotating in such direction and at such speed relatively to thedirection and speed of rotation of said disc-like guide member as to prevent twisting of said edge form-ing warp threads between said device and said guide member, and a drive mechanism for said guide member comprising a rotating memher having stud members extending therefrom parallel to the axis of its rotation, a Geneva gear in combination, a supply device supplyin the edge forming warp threads and comprising a bobbin from which a warp thread is unwound, and a disc-like warp thread guide member rotating about an axis substantially parallel to the weft threads and receiving the edge forming warp threads from said supply device and twisting same together between said disc-like member and the fabric, said edge forming warp threads movhaving slot means periodically engaged by said ing from said supply device, and the latter rostud members, and other gear means connected with said Geneva gear and engaging the periphcry of and, due to the action of said Geneva gear, periodically rotating said disc-like member, a safety guide member connected with said rotating member and having an arcuate peripheral portion, and said Geneva gear having arcuate peripheral portions periodically engaging and meshing with the arcuate peripheral portion of said safety guide member.

3. Amechanism as set forth in claim 1 said stud members being removably connected with said rotating member.

4. A mechanism for forming selvages on fab-- rics woven on gripper shuttle looms, comprising, in combination, a supply device supplying the edge forming warp threads and comprising a.

bobbin from which a warp threadis unwound, and a disc-like warp thread guide member rotating about an axis substantially parallel to the weft threads and receiving the edge forming warp threads from said supply device and twisting same together between said disc-like member and the fabric, said edge forming warp threads moving from said supply device, and the latter rotating in such direction and at such speed relatively to the direction and speed of rotation of'said disclike guide member as to prevent twisting of said edge forming warp threads between said device and said guide member, said supply device including a bobbin carrier carrying said bobbin and rotating about an axis which is substantially in the direction of the edge forming warp thread running oi! said bobbin and from said device.

5. A mechanism for forming selvages on fabrics woven on gripper shuttle looms, comprising. in combination, a supply device supplying the edge forming warp threads and comprising a bobbinfrom which a warp thread is unwound. and a disc-like warp thread guide member rotating about an axis substantially parallel to the weitthreadsandreceivingtheedgeformingwarp threads from said supply device and twisting same together between said disc-like member andths fabric, said edge forming warp threads moving from said supply device. and the latter rotating in such direction and at such speed reltating in such direction and at'such speed relatively to the direction and speed of rotation of said disc-like guide member as to prevent twisting of said edge forming warp threads between said device and said guide member, said supply device including a rotating bobbin carrier rotatably carrying said bobbin, brake means associated with and braking the speed of rotation of said bobbin, and warp thread brake means mounted on said carrier along the path of said warp thread and braking the motion thereof after leaving the bobbin.

7. A-mechanism for forming selvages on fabrics woven on gripper shuttle looms, comprising, in combination, a supply device supplying the edge forming warp threads and comprising a bobbin from which a warp thread is unwound, and

v a disc-like warp thread guide member rotating atively to speed of rotation 01 said disc-like guide member as to myenttwlgt. insofsaid edgeformingwarpm guide member, said gupply device including warp thread brake mean; m sthemovemsntortheedge m hr between me bobbin and B suidemember.

tdmechsnismforformingselvlgelonfabl mrshnttlelooma,

about an axis substantially parallel to the weft threads and receiving the edge forming warp threads from said supply device and twisting same together between said disc-like member and the fabric, said edge forming warp threads moving from said supply device, and the latter rotating in such direction and at such speed relatively to the direction and speed of rotation of said disc-like guide member as to prevent twisting of said edge forming warp threads between said device and said guidemember, said supply device comprising a bobbin carrier rotating about an axis disposed at a right angle to and intersectin: the axis of rotation of said device.

8. A mechanism for forming selvages on fabrics woven on gripper shuttle looms, comprising, in combination, a supply device supplying the edge forming warp threads and comprising. a bobbini'rcmwhichawarpthreadisnnwound.

and a disc-like warp thread guide member ro-'. totingaboutanaxissubstantiallyparalleltoths weft threads and receiving the edge forming warp threads from said supply-device and twisting same together between said disc-like member and the fabric, said edge forming warp threads moving from said supply device, and the latter errotatsbly carryingabcbbinsupplrinsone ofsaidedgerormingwsrp-threadaandssidde- 9' vicehavingahollowaxlememberthrwghwhich anotheredgeformingwarpthreadissuppled.

of rotation of said device. said car- 

